Excitation of Azimuthal Modes in an Axisymmetric Jet

  • R. A. Petersen
  • M. M. Samet
  • T. A. Long
Conference paper
Part of the International Union of Theoretical and Applied Mechanics book series (IUTAM)


Low order azimuthal modes of jet instability are introduced acoustically using an azimuthal array of speakers. The evolution of axisymmetric and helical instabilities, excited at the frequency of the preferred mode, are mapped along the potential core region. The amplification of the axisymmetric mode is much stronger than the helical mode and the agreement between phase locked measurements and stability predictions is much better. Phase-locked measurements of the helical instability show evidence of resonant interaction with other azimuthal modes.


Radial Profile Prefer Mode Momentum Thickness Spectral Distortion Azimuthal Mode 
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  1. 1.
    Wygnanski, I.; Petersen, K.A.: Coherent motion in excited free shear flows. AIAA J., accepted.Google Scholar
  2. 2.
    Petersen, R.A.; Samet, M.M.: On the preferred mode of jet instability. J. Fluid Mech., submitted.Google Scholar
  3. 3.
    Samet, M.M.; Petersen, R.A.: Effects of forcing level on the axisymmetric mixing layer. Bull. Am. Phys. Soc. 31 (1986) 1678.Google Scholar
  4. 4.
    Strange, P.J.K.; Crighton, D.G.: Spinning modes on axisymmetric jets. Part 1. J. Fluid Mech. 134 (1983) 231–245.ADSCrossRefGoogle Scholar
  5. 5.
    Batchelor, G.K.; Gill, A.E.: Analysis of the stability of axisymrnetric jets. J. Fluid Mech. 14 (1962) 529–551.MathSciNetADSMATHCrossRefGoogle Scholar
  6. 6.
    Morris, P.J.: The spatial viscous instability of axisymmetric jets. J. Fluid Mech. 77 (1976) 511–529.ADSMATHCrossRefGoogle Scholar
  7. 7.
    Chan, Y.Y.: Wavelike eddies in a turbulent jet. AIAA J. 15 (1977) 992–1001.ADSCrossRefGoogle Scholar
  8. 8.
    Crow, S.C.; Champagne, F.H.: Orderly structure in jet turbulence. J. Fluid Mech. 48 (1971) 547–591.ADSCrossRefGoogle Scholar
  9. 9.
    Gutmark, E.; Ho., C.M.: On the preferred modes and the spreading rates of jets. Phys. Fluids 26 (1983) 2932–2938.ADSCrossRefGoogle Scholar
  10. 10.
    Lessen, M.; Sadler, S.G.; Liu, T.Y.: Stability of pipe Poiseuille flow. Phys. Fluids 11 (1968) 1404–1408.ADSMATHCrossRefGoogle Scholar
  11. 11.
    Lessen, M.; Singh, P.J.: The stability of axisymmetric free shear layers. J. Fluid Mech. 60 (1973) 433–457.ADSMATHCrossRefGoogle Scholar
  12. 12.
    Gaster, M.; Kit, E.; Wygnanski, I.: Large-scale structures in a forced turbulent mixing layer. J. Fluid Mech. 150 (1985) 23–39.ADSCrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1988

Authors and Affiliations

  • R. A. Petersen
    • 1
  • M. M. Samet
    • 1
  • T. A. Long
    • 1
  1. 1.Department of Aerospace and Mechanical EngineeringUniversity of ArizonaTucsonUSA

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